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Supra just cut out! UPDATED- 11th April!


Attero

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So was just going out for a quick drive when 20 seconds in (annoyingly over several speed bumps so was difficult to get back home), the supra cuts out and dies. No choking or anything. Just stops dead and rolls.

 

Usually when on ignition, my fuel pump runs prior to crank but it no longer does. I would try to turn it over and the engine struggles to start as it attempts to crank.

 

After a few attempts and looking around, I try it again and now it won't even crank. It now just ticks.

 

The last time I try it, my indicators flash a couple of times as I stop.

 

Have tried to jump start the car and check connector on fuel pump but no luck.

 

Does anyone have any ideas what this could be related to?

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  • 2 weeks later...

Ok so I solved one issue which was that a wire had come loose from the ignition switch which obviously stopped the engine from igniting at all. I have a silly custom switch (want to switch it back to the barrel at some point).

 

Now we go back to the original problem which is that the engine won't start because the fuel pump is not priming.

 

The fuel pump is usually very loud and is constant because of the Apexi ECU I have installed. But it's just not doing anything when the ignition is on.

 

I have tried bridging the diag port but was then told that an aftermarket ECU won't use the standard diag port.

 

Checked the connection the fuel pump ECU but seemed fine. Is there anything else I can do with it?

 

How else can I get power to the pump?

 

All fuses seemed fine.

 

 

Note that I have a Walbro fuel pump + Apexi ECU. When the ignition is on, the fuel pump primes constantly and can heard clearly from the drivers seat.

Edited by Attero (see edit history)
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Sounds like the issues I have with mine right now.

Unfortunately I haven't solved it yet as I haven't had the time. Mine would start then die after a few seconds.

I replaced the fuel pump (as it was still stock and wasn't priming anyway), checked the plugs and cleaned them up (going to replace those next), coil pack clips seem fine.

 

So after replacing the plugs I'll be checking for ignition as that seems to be the problem now. For me it must be plugs, injectors, or coil packs, as I can hear fuel coming through, so must be ignition related.

 

I kind of prattled on a bit there but hopefully something helps at least get you started.

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It might sound silly BUT....

 

I had a problem last year where my car died and wouldnt start, it would just turn over and occasionally almost fire

 

The problem turned out to be the single pin temp sensor that sits in the top water neck

 

The wire had broke away from the connector, if i touched the wire onto the pin the car would start instantly, it would then cut out when the wire was removed and wouldnt start agin unless the wire was connected

 

Not sure why that particular sensor causes the car to not start but since ive repaired it ive had no issues at all

Edited by berg (see edit history)
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Anything wrong with the car alarm wiring? Flashing indicators could be an indication that the immobiliser isn't deactivated so not allowing the fuel pump to prime.

 

When my car cut out and wouldn't start, turns out there was a problem with the wiring on my FCD. Once that was all fixed, happy days! Do you have an FCD, or does the Apexi ECU deal with Fuel Cut bypass?

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Well what I've decided to do is take out the mess of a jungle that resides behind the dashboard and replace it all with a new loom now because to be honest it could be anything. So many wires just hanging around, some bare which I was concerned about!

 

I've put power into the fuel pump and it works fine and even started up. I'm not sure it's the alarm in this case but it's such a big mess and has a custom switch so I'll be switching back to the ignition barrel which I'm happy about.

 

I'll be replacing the fuel pump ECU too and while im at it, I'll be replacing my spark plugs and coil packs and then book in for a remap.

 

I'll be laughing if it doesn't work after that. :D

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  • 3 weeks later...

Evening guys. ripped_fear and Attero Just updating this thread and will try describe everything as detailed as possible.

-Battery fully charged

-So Relays and fuse in engine bay have been checked and are working correctly

-The fuel pump ecu has been changed for another known used part

-there is a relay in the passenger foot well which looks to be aftermarket and is functioning correctly.

-All plugs on the apexi look to be connected fine.

-both earths are bolted tight and look to be in order.

-the power wire from said relay in the foot well to fuel pump looks fine.

-and all wiring to the fuel pump ecu looks unmolested and stock.

-A mechanic has tested and confirmed the wires to the ecu are fully working

 

The only thing we have found is the power wire from the relay to the pump has a bullet connector to it, as does a ground from the pump to the cars boot space, both have been played with to no success, anyone have any other ideas on what to check while we are both here?

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Is the fuel pump ECU wired back to the main ECU as stock?

 

Have you checked the Apexi ECU is sending out the fuel pump on signal, should be pin 22A on stock MKIV connector and a 0-5V output to the fuel pump ECU in the boot.

 

The AEM install guide is always helpful when looking at the stock connector :D

 

http://www.jegs.com/InstallationInstructions/0/017/017-30-1100.pdf

 

http://aemelectronics.com/files/instructions/30-6100%20Series%202%20Plug%20&%20Play%20EMS.pdf

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The Apexi hand controller will show if the ecu is trying to output a pump run signal, do you have the hand controller? Your wiring sounds like a prime example of why I cringe when people ask me to fit some new gauge or gizmo, totally ruining the factory loom seems a life mission for some folk ;) Removing a dash panel is always a worrying experience, I see very few cars that haven't had someone historically having tried to fit coloured LED's or the dreaded turbo timers, alarms that do everything except work properly, blh blah.

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I completely agree Chris. It's a complete mess and have been suggested to replace the entire loom by a mechanic. I thought surely it wasn't necessary but I'm still considering it to be honest - even if I can fix it without.

 

I might be able to get my hands on a hand controller.

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Is the fuel pump ECU wired back to the main ECU as stock?

 

Have you checked the Apexi ECU is sending out the fuel pump on signal, should be pin 22A on stock MKIV connector and a 0-5V output to the fuel pump ECU in the boot.

 

The AEM install guide is always helpful when looking at the stock connector :D

 

http://www.jegs.com/InstallationInstructions/0/017/017-30-1100.pdf

 

http://aemelectronics.com/files/instructions/30-6100%20Series%202%20Plug%20&%20Play%20EMS.pdf

Bit of a foreign language to me mate but as said a mechanic has confirmed the power to the fuel pump ecu.not sure if this answers your sugestion? Also the wiring to the ecu looks stock it's just the wires from the pump to the footwell which don't.

 

 

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The Apexi hand controller will show if the ecu is trying to output a pump run signal, do you have the hand controller? Your wiring sounds like a prime example of why I cringe when people ask me to fit some new gauge or gizmo, totally ruining the factory loom seems a life mission for some folk ;) Removing a dash panel is always a worrying experience, I see very few cars that haven't had someone historically having tried to fit coloured LED's or the dreaded turbo timers, alarms that do everything except work properly, blh blah.

As luke says totally agree with you, but would be nice to see her running again before we tackle a job like that just to locate the issue as to where the problem lies. It seems strange that it was running fine then just shut down unless there is simply a dodgey conection somewhere or a blown fuse to me. I'm a complete novice at electrics but just trying to think logically in my mind anyway lol

 

 

Edited by ripped_fear (see edit history)
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Bit of a foreign language to me mate but as said a mechanic has confirmed the power to the fuel pump ecu.not sure if this answers your sugestion?

 

Not really, I suspect the fuel pump ECU is powered at 12v and fused, the signal from the stock / apexi should be a 5v signal to trigger the pump output.

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I would check it at the ECU pin and if that works check at the fuel pump ECU, if that works and the fuel pump is still not activating it could be the fuel pump ECU or wiring from there to the pump.

 

 

EDIT: or as Chris mentioned earlier, check on the Apexi Commander if the ECU is sending the signal in the first place ;)

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